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Noc Świętojańska (other names: Sobótka/Sobótki, Noc Kupały, Kupalnocka) - summer solstice celebrations in Włocławek, Poland, photographed by Mariusz Maciejewski.

Birch tree is a broadleaved deciduous hardwood tree of the genus Betula in the family Betulaceae. The genus Betula contains 30 to 60 known taxa of which 11 are on the IUCN 2011 Red List of Threatened Species. They are typically rather short-lived pioneer species widespread in the Northern Hemisphere, particularly in northern temperate and boreal climates. This tree is sometimes called "The Watchful Tree" because of eye-like impressions on the bark.